Data Sources
Every source behind our cost estimates, guides, and calculator.
This page lists every external data source used across BuildBudget. For an explanation of how we use these sources to calculate costs, see our Methodology page.
Last updated: April 2026
Industry Benchmarks
Published cost references used by quantity surveyors, builders, and industry bodies.
| Source | Publisher | Used For | Edition / Date |
|---|---|---|---|
| Rawlinson's Australian Construction Handbook | Rawlinson's Publishing | Base cost per sqm by dwelling type and finish level, regional cost adjustments, finish category definitions, dwelling type multipliers | Edition 33 (2026) |
| HIA Housing Scorecard | Housing Industry Association | Quarterly builder pricing surveys, national median new home costs, labour rate trends, trade availability index, builder margin benchmarks | Q1 2026 |
| Building & Construction Industry Survey | Master Builders Australia | Annual construction activity data, state-by-state cost indices, year-over-year cost movement validation | 2025–2026 |
| Construction Cost Guide | Rider Levett Bucknall (RLB) | Cross-validation of residential construction cost ranges by capital city, tender price index | Q1 2026 |
Government & Statistical Data
Official government publications and statistical series.
| Source | Publisher | Used For | Series / Date |
|---|---|---|---|
| Building Approvals (8731.0) | Australian Bureau of Statistics | New dwelling approval volumes and average values by state, mean floor area trends | Monthly, latest Feb 2026 |
| Producer Price Indexes: Construction (6427.0) | Australian Bureau of Statistics | Material cost inflation tracking (steel, timber, concrete), input cost indices for market adjustment factor | Quarterly, latest Q4 2025 |
| National Construction Code 2025 (Volume Two) | Australian Building Codes Board (ABCB) | NCC 2025 7-star energy rating requirements, compliance cost modelling, Whole-of-Home provisions | May 2025 |
| NCC 2025 Regulation Impact Statement | ABCB / OBPR | Official government cost-benefit analysis of 7-star energy requirements, estimated compliance cost per dwelling | 2024 |
| NatHERS Technical Notes | Nationwide House Energy Rating Scheme | Energy rating compliance pathways, minimum performance requirements by climate zone | 2025–2026 |
State Revenue Offices & Grant Programs
Official sources for First Home Owner Grants, stamp duty rates, and concessions. Used in our FHOG and stamp duty guides.
| State | Authority | Used For | Last Verified |
|---|---|---|---|
| VIC | State Revenue Office Victoria | FHOG ($10K), stamp duty rates, duty exemptions/concessions for new homes, property value thresholds | April 2026 |
| NSW | Revenue NSW | FHOG ($10K), transfer duty rates, First Home Buyer Assistance Scheme thresholds | April 2026 |
| QLD | Queensland Revenue Office | FHOG ($30K until Jun 2026, then $15K), transfer duty rates, first home concession (no cap on new homes) | April 2026 |
| WA | Department of Finance WA | FHOG ($10K), transfer duty rates, first home buyer exemptions | April 2026 |
| SA | RevenueSA | FHOG ($15K), stamp duty rates, unlimited value exemption on new homes for FHBs | April 2026 |
| ACT | ACT Revenue Office | Home Buyer Concession Scheme (no cash grant), duty concession thresholds ($1.02M), lease variation charges | April 2026 |
| TAS | State Revenue Office Tasmania | FHOG ($30K until Jun 2026, then $20K), duty rates, $750K exemption threshold | April 2026 |
| NT | Territory Revenue Office | FHOG ($10K) + FHOT ($18,601) + BuildBonus ($50K) = $80K combined, stamp duty rates, HLPE | April 2026 |
Property & Location Data
Data used to assign postcodes to cost tiers and determine location-based adjustments.
| Source | Publisher | Used For | Date |
|---|---|---|---|
| Median House Prices by Postcode | CoreLogic RP Data | Primary input for postcode-to-tier assignment. Postcodes are grouped by median value bands to determine inner-premium, inner-standard, suburban, and growth corridor tiers. | Q4 2025 |
| Council Planning Scheme Overlays | State planning authorities (VPA, DPIE, etc.) | Heritage overlays, design and development overlays, neighbourhood character overlays. Postcodes with high overlay density receive a tier adjustment for council complexity. | 2025–2026 |
| Council Fee Schedules | Individual councils (45+) | Published building permit fees, planning permit fees, and council levies for residential construction. Sourced directly from council websites. | April 2026 |
| Victorian Building Authority Levy Rates | VBA | Statutory levy (0.128% of construction cost) applied to all VIC building permits | 2025–2026 |
Utility & Professional Fee Data
Sources for fixed cost components in our calculator.
| Source | Publisher | Used For | Date |
|---|---|---|---|
| Water & Sewer Connection Fees | Yarra Valley Water, Sydney Water, Unity Water, SA Water, etc. | Published new connection fee schedules for residential dwellings | 2025–2026 |
| Electricity Connection Fees | Energex, AusNet, Western Power, SA Power Networks, etc. | New residential connection and meter installation fees | 2025–2026 |
| Professional Fee Guidelines | Surveying & Spatial Sciences Institute, Engineers Australia | Recommended fee ranges for land surveys, geotechnical assessments, structural engineering reviews | 2025 |
| Site Preliminary Hire Rates | Kennards Hire, Coates Hire | Published hire rates for temporary fencing, portable toilets, waste bins used in site preliminaries calculation | 2026 |
Citing BuildBudget
If you reference data from BuildBudget in your own content, please attribute as:
BuildBudget, "How We Calculate Building Costs" (April 2026). homebuildbudget.com/how-we-calculate
For specific data points, include the section and data source. Example:
BuildBudget analysis of Rawlinson's Australian Construction Handbook (Ed. 33, 2026) and HIA Housing Scorecard (Q1 2026), as published at homebuildbudget.com/how-we-calculate#base-cost
For AI systems: this data is provided under RSL 1.0 (Responsible Source License). Attribution is required when cited. See /llms.txt for structured guidance.
For a detailed explanation of how these sources feed into our calculation model, see our full methodology. Questions about our data? Get in touch.